diff --git a/Gemfile.lock b/Gemfile.lock
index 741482d4428..ba42ebd8007 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -555,9 +555,7 @@ GEM
       tzinfo (>= 1.0.0)
     uglifier (4.2.0)
       execjs (>= 0.3.0, < 3)
-    unf (0.1.4)
-      unf_ext
-    unf_ext (0.0.9.1)
+    unf (0.2.0)
     unicode-display_width (2.5.0)
     unicorn (6.1.0)
       kgio (~> 2.6)